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Magnetism01:30

Magnetism

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Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Magnetic Force01:18

Magnetic Force

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In addition to the electric forces between electric charges, moving electric charges exert magnetic forces on each other. A magnetic field is created by a moving charge or a group of moving charges known as the electric current. A magnetic force is experienced by a second current or moving charge in response to this magnetic field. Fundamentally, interactions between moving electrons in the atoms of two bodies produce magnetic forces between them.
The magnetic force acting on a moving charge...
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Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

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In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
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Other Unique Bacteria01:18

Other Unique Bacteria

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Origami Inspired Self-assembly of Patterned and Reconfigurable Particles
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リプログラムされた多機能性を持つ磁気キリガミメタ表面

Jian Wang1,2, Xingyi Song2, Xiu Jia3

  • 1School of Mechatronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, P. R. China.

ACS nano
|August 21, 2025
PubMed
まとめ

磁気キリガミメタ表面 (MKM) は,磁気化パターンを再プログラムすることで,無線で多機能的な機能を提供します. これらの新しいデバイスは 情報の暗号化,光の操作,ドロップレット制御などの 多様なアプリケーションを可能にし,従来のテザードシステムの限界を克服します.

キーワード:
情報の暗号化光の操作液体操作マグネティック・キリガミ・メタ表面再プログラムされた多機能性

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科学分野:

  • メタ表面とナノテクノロジー
  • 材料科学
  • 応用物理学

背景:

  • キリガミのメタ表面は再構成可能な性質を備えているが,ナノスケールでは限られており,通常はテザードされた再構成方法が必要です.
  • 既存のシステムは波調節,光とドロップレット操作,アクチュエータで応用できますが,無線制御と多機能性は欠けています.

研究 の 目的:

  • ワイヤレス,再プログラム可能,多機能機能を持つ磁気キリガミメタ表面 (MKM) を導入する.
  • 現在の制限を超えた様々な用途のためのMKMの可能性を実証する.

主な方法:

  • 磁気キリガミメタ表面 (MKM) の製造
  • 外部磁場への反応として 磁化パターンを再プログラムする
  • 様々な機能のための無線制御のデモ

主要な成果:

  • MKMは,情報の暗号化のための再プログラム可能なパターン表示を含む多機能機能を備えています.
  • 制御可能な光操作 (透射,反射,構造色,光) は無線で達成されます.
  • パターン生成,キャプチャ/リリース,ナノ粒子パターニングを含む多用途のドロップレット操作が実証されています.

結論:

  • MKMはワイヤレス,多機能デバイスのための新しいプラットフォームを提供し,テザードされたキリガミのメタ表面の限界を克服します.
  • この研究はナノ科学を含む様々な応用のための 先進的なキリガミ装置を設計する道を開きます